IR-Active Phonons and Structure Elements of Isotope-Enriched Boron Carbide
| Autor: | S.O. Shalamberidze, Roland Schmechel, T. Au, A.M. Eristavi, H. Werheit, G.I. Kalandadze |
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| Rok vydání: | 2000 |
| Předmět: |
Isotope
Chemistry Phonon Chemie Infrared spectroscopy Boron carbide Electron deficiency Neutron scattering Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Crystallography chemistry.chemical_compound Molecular vibration Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Stoichiometry Elektrotechnik |
| Zdroj: | Journal of Solid State Chemistry. 154:79-86 |
| ISSN: | 0022-4596 |
| DOI: | 10.1006/jssc.2000.8815 |
| Popis: | The IR phonon spectra of 10 B, 11 B, and 13 C isotope-enriched boron carbide with the compositions B 4.3 C, B 6.5 C, and B 10 C are presented. Specific phonons are attributed to the stretching and the bending mode of a small concentration of CCC chains, whose occurrence seems to depend on the specific preparation conditions. Based on the assumption that the electron deficiency is compensated by structural defects, the concentrations of CBC, CBB, CCC, and B□B arrangements are determined for the whole homogeneity range. Then the concentrations of B 12 and B 11 C icosahedra result from the compound stoichiometry. The concentration of B□B arrangements, calculated this way, excellently agrees with the concentration of B(3) vacancies obtained by neutron scattering. |
| Databáze: | OpenAIRE |
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